[Bug 47832] FindFirstFileExW believes every directory entry has been read if NtQueryDirectoryFile underfills buffer

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=47832

--- Comment #12 from qsniyg <qsniyg at mail.com> ---
(In reply to Joe Davison from comment #10)
> This was fixed in 4.21 but it appears there's been a regression since. The
> last version of Wine that Mod Organizer's USVFS is functional in, as far as
> I can tell, is 5.0.
> 
> In an initial attempt to figure out the cause I looked at kernelbase/file.c
> where most of kernel32/file.c is now located and found some discrepancies. I
> made a frankensteined file.c containing Myah's patch but it had no effect.
> 
> At any rate, I think this bug should be reopened as there definitely seems
> to be a regression.

The patch is still there, the important bit for this issue is that the
`info->data_len < info->data_size - max_entry_size` check has been removed,
which is still the case.

If USVFS fails, then something else is the cause. There could be a number of
different causes. An issue that was exhibited in one of the later staging
releases was that wine would call internal versions of the syscalls, rather
than the exported thunks, which meant that it would bypass USVFS's hooked
calls. This has since been fixed, but it's not unlikely that this might be
exhibited somewhere else by accident.

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